1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
10
11// template<class E2> friend constexpr bool operator==(const expected& x, const unexpected<E2>& e);
12
13#include <cassert>
14#include <concepts>
15#include <expected>
16#include <type_traits>
17#include <utility>
18
19#include "test_macros.h"
20#include "../../types.h"
21
22#if TEST_STD_VER >= 26
23// https://wg21.link/P3379R0
24static_assert(CanCompare<std::expected<EqualityComparable, EqualityComparable>, std::unexpected<int>>);
25static_assert(CanCompare<std::expected<EqualityComparable, int>, std::unexpected<EqualityComparable>>);
26static_assert(!CanCompare<std::expected<EqualityComparable, NonComparable>, std::unexpected<int>>);
27#endif
28
29constexpr bool test() {
30 // x.has_value()
31 {
32 const std::expected<EqualityComparable, EqualityComparable> e1(std::in_place, 5);
33 std::unexpected<int> un2(10);
34 std::unexpected<int> un3(5);
35 assert(e1 != un2);
36 assert(e1 != un3);
37 }
38
39 // !x.has_value()
40 {
41 const std::expected<EqualityComparable, EqualityComparable> e1(std::unexpect, 5);
42 std::unexpected<int> un2(10);
43 std::unexpected<int> un3(5);
44 assert(e1 != un2);
45 assert(e1 == un3);
46 }
47
48 return true;
49}
50
51int main(int, char**) {
52 test();
53 static_assert(test());
54 return 0;
55}
56

source code of libcxx/test/std/utilities/expected/expected.expected/equality/equality.unexpected.pass.cpp